# comm(1)

## NAME

         comm - print lines common to two sorted files

## SYNOPSIS

         comm [-123] file1 file2

## OPTIONS

         -1   Suppress column 1 (lines present only in file1)

         -2   Suppress column 2 (lines present only in file2)

         -3   Suppress column 3 (lines present in both files)

## EXAMPLES

         comm file1 file2    # Print all three columns

         comm -12 file1 file2
                             # Print only lines common to both files

## DESCRIPTION

         Two sorted files are read  and  compared.   A  three  column  listing  is
         produced.   Files  only in file1 are in column 1; files only in file2 are
         in column 2; files common to both files are in column 3.  The file name -
         means stdin.

## SEE ALSO

         cmp(1), diff(1), sort(1).